diff --git a/common/environment/configure/automake/config.guess b/common/environment/configure/automake/config.guess
index 2c723006e2..8d70ec2b26 100755
--- a/common/environment/configure/automake/config.guess
+++ b/common/environment/configure/automake/config.guess
@@ -1,4 +1,5 @@
-ttempt to guess a canonical system name.
+#! /bin/sh
+# Attempt to guess a canonical system name.
 #   Copyright 1992-2020 Free Software Foundation, Inc.
 
 timestamp='2020-09-19'